You will need to modify a distributer to turn the oil pump. Basically machine off the upper part and add a bushing to keep the top of the shaft supported. Shorten the shaft and then come up with a way to seal the top of it. A clamp on breather might even be enough to take care of it?
If you cut the shaft shorter than the stub of the housing you can weld the hole in the top of the housing shut. The pain would be when you install it to be able to turn the shaft so it engages the oil pump drive. Even that isn't too bad as you can wrench the engine over until it drops into place.
Mike
